Gas burner



Oct. 4, 1938. P, MQFORSTER I 2,132,020 GAS BURNER Fil edvJan. 21, 1937 IN VEN TOR.

A TTORNEY Patented Oct. 4, 1938 UNITED STATES PATENT oFrIcr.

GAS BURNER Percy M. Forster, Berkeley, Calif.

Application January 21, 1937, Serial No. 121,487

3 Claims. (01. 158118) threaded as at I8 and is threaded. through a V This invention relates to burners using combustible gas and air as a fuel.' I

It is the principal object of the present invention to provide an improved gas burner which may be efficiently used either with gases of the type of natural gas or with the type of gases that are commonly termed tank gases, such as butane and propane or the like, which burner may be connected to sources of both types of gases simultaneously and by simple manipulation utilize either one efiiciently as a fuel.

In practicing my invention, I provide a burner body fitted with a main orifice associated with a burner head. The burner body is provided with a connection for natural type gas and when this connection is efiective, the gas is discharged into the body and then through the main orifice into the burner head. The burner body is provided with a second connection for tank type of gas, which connection is separate from the firstnamed. A means is provided for enabling the tank type of gas to be discharged through a secondary orifice and thence through the firstnamed into the burner head for ignition. The burner body is provided with a secondary air admission means for supplying additional air necessary for combustion, when using the tank type of gas. Therefore, by simple manipulation, the burner embodying my invention may be readily converted from a natural type gas burner into a tank type gas burner, or vice versa.

One form which the invention may assume is exemplified in the following description and illustrated by way of the accompanying drawing,

in which: I

The figure is a View in central longitudinal section through a burner embodying the preferred form of my invention.

Referring more particularly to the accompanying drawing, I 0 indicates a burner body having a main orifice fitting H removably fitted to one of its ends. The fitting II is formed with a main orifice M of a diameter suitable for use in connection with natural gas or gas having similar combustible characteristics. Removably secured to the body l0 about the end of the same adjacent the orifice fitting II and projecting coaxially therefrom in axial alignment with the orifice I4 is a Venturi type burner head l5 having the usual air ports l6 for supply air necestransverse partition l9 separating the interior of the burner body In into a primary chamber 20 and a secondary chamber 2!. Suitable packing means 22 is provided to prevent leakage about the conductor tube ll where it projects through the end of the burner body l0.

At its outer end the conductor tube ll is fitted with a hand wheel 23 by means of which it may be revolved. By revolving the conductor tube ll, its threaded engagementwith the partition l9 causes its inner or orifice end to move toward or away from the main orifice [4, depending upon the direction of rotation.

The inner end of the conductor tube is hollow, as illustrated, and its extremity is fitted with a removable orifice fitting 24. This orifice .fitting 24 is fitted with a secondary orifice 25 of a diameter suitable for use in connection with gases of the type of butane or the like. I desire to point out here that different sized orifices are necessary for tank type gases than are used in connection with the natural type of gas.

The conductor tube ll is formed with a series of radial ports 26 forming a communication between its interior and the secondary cham ber 2| so that gas entering the secondary chamber 2! will pass into the conductor tube H and discharge through the orifice 25. When this orifice is in proper relation to the orifice M, the gas will be injected into the burner head I5, where it will mix with air and may be ignited.

The primary chamber 20 is fitted with a connection 21 led to a source of supply of natural type of gas. This connection 21 is controlled by a valve 28. The secondary chamber 2! is fitted with a connection 29 leading to a source of tank type of gas, such as butane or the like, which connection is controlled by a valve 30.

The primary chamber 20 is also connected to the atmosphere by a connection 3| and a valve 32. The purpose of this'connection is to supply auxiliary air when the burner is utilizing tank type gas as a fuel. It should be, pointed out here that the ordinary ratio of air to natural gas for a proper combustion is approximately eleven to one, while in connection with butane, for example, the proportion is thirty-three to one. So, therefore, it is obvious that when using butane or like gases, additional air may be necessary.

In operation of the device, assuming that the parts are in the positions shown with the valves 28, 30 and 32 closed and it is desired to operate the burner on natural gas, the valve 28 is opened and the gas discharges into the primary chamber 20, thence around the inner end of the conductor tube I! through the orifice l4 into the burner head I5. This, of course, causes air to be drawn through the ports l6 in sufiicient quantity to form a proper combustible mixture for ignition at the outer end of the burner head I In the event that it is desired, for any reason, to utilize tank gas, which is connected to the burner body l0 through the connection 29, instead of natural gas, the valve 28 is closed and the valve 30 is opened so that the tank gas will discharge into the secondary chamber 21, thence into the conductor tube I! through the radial ports 26. The gas so entering the conductor tube I! will discharge through the orifice and thence through the orifice l4 into the burner head I5. At the same time, the hand wheel 23 is turned in a direction to advance the orifice end of the conductor tube I! into the proper cooperating relation with the orifice I4. I find that it is necessary to have the orifice 25 in close proximity to the inner end of the orifice M for the best results.

For supplying additional air'to. support the combustion when using tank type of gas, the valve 32 is opened so that the air may flow into the primary chamber 20 and be drawn around the, inner end of the conductor tube IT and through the orifice l4 with the gas discharging through the secondary orifice 25. It is obvious that a sort of a suction action will be created by the jet emerging from the secondary orifice In the event that it is desired to switch back from tank type gas to natural gas, the valves and 32 are closed, the conductor tube I! is withdrawn 'suificiently to permit the flow of natu'ral' gas through the orifice I4, and the valve 28 is then opened and the device will operate with natural gas as a fuel.

It is seen that by the provision of. my present invention a stand-by may be provided for a burner. That is to say, a burner normally operating on natural or manufactured gas and connected with the usual mains may also be con nee-ted with a tank of tank type gas so that in the event of failure of the supply of natural or manufactured gas, the tank type gas may be immediately utilized to maintain the burner in operation. It is readily obvious that this situation may be the reverse, but that the same is of no particular importance to the present invention.

From the foregoing it is obvious that I have provided a very simple andefiicient gas burner which is readily adaptable to the use of different types of gas as a fuel, and while I have shown the preferred form of my invention, it is to be understood that various changes may be made in its constructionby those skilled in the art without departing from the spirit of the invention as defined in the appended claims. Having thus described my invention, what I claim and desire to secure by Letters Patent is:

1. A burner of the character described comprising a burner body having a primary chamber and a secondary chamber formed therein, said body having a main orifice in direct communication with the primary chamber, a hollow conducting member extending from the secondary chamber into the primary chamber to a point adjacent the main orifice, the said conducting member having a secondary orifice in its end adjacent the main orifice and in axial alignment therewith, the said conducting member communicating with the secondary chamber, a separate valve controlled means for admitting the flow of gas'into each chamber, valve controlled means for admitting air into said primary chamber, and a burner head carried by the body I in cooperative relation to the main orifice.

2. A burner of the character described comprising a burner body formed with a primary chamber and a secondary chamber, said body having a main orifice formed therein in direct communication with the primary chamber, a hollow member extending from the secondary chamber into the primary chamber with its in- 3. A burner of the character described com- V prising a burner body, a partition in said body dividing the interior thereof into primary and secondary chambers, said body having an orifice formed therein at the end of the primary chamber opposite the secondary chamber and in direct communication with the primary chamber, a conductor member projecting into the body I through the opposite end thereof and extending through the secondary chamber threaded through'said partition and projecting into said primary chamber in axial alignment with said main orifice and with its inner end positioned adjacent the main orifice, the inner end of said member being formed with a secondary orifice in axial alignment with the main orifice, means for turning said member to advance or retract its inner end with respect to said mainorifice, the interior of said member being in communication with the secondary chamber only, separate valve controlled means for admitting the flow of a gas into either the primary or secondary chambers, a valve controlled means for admitting air into the primary chamber, and a burner head carried by the body in cooperative relation to the main orifice. r

PERCY M. FORSTER. 

